Throwing Errors in JavaScript

From the JavaScript cheat sheet · Error Handling · verified Jul 2026

Throwing Errors

Creating and throwing custom errors

javascript

// Throwing errors
throw new Error('Something went wrong');

// Custom error class
class ValidationError extends Error {
  constructor(message) {
    super(message);
    this.name = 'ValidationError';
  }
}

throw new ValidationError('Invalid input');

💡 Create custom error classes for specific error types

⚡ Include relevant data in custom errors for better debugging

📌 Error.cause helps chain errors with context

🔥 Always throw Error objects, not strings

More JavaScript tasks

Try/Catch/Finally
Error Types

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